Testosterone level in men

So, how does one ensure that testosterone levels remain in balance?
Some doctors suggest that monitoring testosterone levels every five years,
starting at age 35, is a reasonable strategy to follow. If the testosterone
level falls too low or if the individual has the signs and symptoms of low
testosterone levels described above, testosterone therapy can be considered.
However, once testosterone therapy is initiated, testosterone levels should be
closely monitored to make sure that the testosterone level does not become too
high, as this may cause stress
on the individual, and high testosterone levels may result in some of the negative problems
(described previously) seen.